As for competitors, I think there is WavSep but I'm not sure how suitable it is for Yahoo's use case (it looks like an overgrown J2EE app). People involved in that project infrequently rank scanners on their blog:
* https://code.google.com/p/wavsep/
* http://sectooladdict.blogspot.ro/2014/02/wavsep-web-applicat...
I have the feeling that the Yahoo bug bounties are about to get a whole lot harder to claim.
Unfortunately, this will do nothing for the engineering hours being sunk into monitoring the thousands of invalid reports submitted each year.
http://www.army.mil/article/141734/Army_cyber_defenders_open...
Nah; that must be a coincidence. After all, why would somebody after the US Military try to convince people that their security was better? Do you honestly think Yahoo has better stuff than the Tony Stark of the armed forces?
Please. Let's see, Ycombinator's got some ex-Yahoo's as alumni, I'm sure they'll chime in and disagree with me any moment. Yep yep. Bring it.